1.College of Ocean and Civil Engineering, Dalian Ocean University, Dalian; 2.Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian; 3.College of Marine Technology and Environment, Dalian Ocean University, Dalian; 4.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian
Abstract: In this paper, a three-dimensional turbulence numerical calculation model was established using computational fluid dynamics(CFD), and flow field characteristics in single-drain square aquaculture tank with different single sizes of arc angle(the ratio of arc radius to width of the tank, i.e.relative arc width ratio: 0-0.5)and inlet flow rate(400, 814, 1174 L/h)were investigated, and the types of aquaculture tank are defined based on the flow field characteristics of tanks in order to improve the flow field characteristics of square aquaculture tanks via high space utilization rate by combining the advantages of better hydrodynamic characteristics in circular tank with high space utilization rate in square tank, and to optimize the square aquaculture tanks by replacing the right angle with the arc angle.The results showed that the average velocity was found to be increased in the tanks with 0.2≤R/B<0.4 is compared with square tank, with decrease in the resistance coefficient, and significantly high flow field uniformity at large inlet flow rate, different from that in the circular tanks.This type of aquaculture tank is defined as square arc angle aquaculture tank.The findings indicated that the square arc angle tank with R/B of 0.20 and 0.25 had better uniformity of flow field and high space utilization, and that provided theoretical basis and preferred design parameters for the design of square arc angle aquaculture tanks.
2020, Vol. 35 
